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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74e4cd331bc319339ca2095a3c14f9a15134575844678b43e2390d4d69ce7202' 
  AND token = 'c/OzoiBoppThYYrw46W6CGhoVg2Wh6U5WSXmj7WretA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}